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Type: Artigo de periódico
Title: Sex and season affect individual-level diet variation in the neotropical marsupial Gracilinanus microtarsus (Didelphidae)
Author: Martins, EG
Araujo, MS
Bonato, V
dos Reis, SF
Abstract: Individual-level diet variation was investigated in Gracilinanus microtarsus, an insectivorous marsupial whose diet is affected by sex and season in the highly seasonal Brazilian Cerrado. To measure individual-level diet variation, the diets of individual males and females were compared to that of their population in the warm-wet and cool-dry seasons using the proportional similarity index (PSi). This index varies from 1 (complete overlap between the individual i 's and population's diets) toward 0 (decreasing overlap). Mean PSi values were computed as a measure of the degree of interindividual diet variation (the larger the mean PSi value, the smaller the variation among individuals' diets). Interindividual diet variation among females was similar between seasons, whereas among males it decreased from the warm-wet to the cool-dry season. Diet variation among males is probably reduced in the cool-dry season because of constraints on food consumption generated by interactions between endogenous (physiological needs associated with high rates of body mass growth) and exogenous (food limitation) factors.
Subject: Brazil
gracile mouse opossum
intrapopulation variation
Country: Inglaterra
Editor: Blackwell Publishing
Rights: fechado
Identifier DOI: 10.1111/j.1744-7429.2007.00319.x
Date Issue: 2008
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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